Start-up of CERN's New Antimatter Factory

<!DOCTYPE html> <html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# "> <head> <meta charset="utf-8" /> <script>var _paq = _paq || [];(function(){var u=(("https:" == document.location.protocol) ? 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CERN1's unique new antimatter factory, the Antiproton Decelerator (AD) has begun delivering antiprotons to experiments. These experiments will study antimatter in depth to determine if there is a difference between it and ordinary matter. Any difference between antimatter and matter would be extremely interesting since it is not yet understood why the universe is made of matter. Physicists believe that the Big Bang created equal amounts of antimatter and matter, which would then have annihilated, leaving nothing. The great mystery is why there was enough matter left over to from the universe. CERN is probably best known for enormous accelerators and research using very high energy particle beams. The AD is the antithesis. It is only 188 metres in circumference and is designed to actually decelerate particles rather than accelerate them. It takes high energy antiprotons, groups them together tightly in bunches, slows them down to the leisurely pace - by CERN standards - of a tenth of the speed of light, and delivers them to experiments. At this point, the remarkable technical sophistication of the experiments takes over. The experiments either capture the antiprotons in cages of electromagnetic fields or insert them into ordinary atoms. The velocity of the trapped antiprotons is now reduced to a few millionths of the speed of light. The once unruly antiprotons are virtually at standstill and further study can begin. Two experiments, ATHENA and ATRAP, aim to add positrons - anti-electrons - to the caged antiprotons to make atoms of antihydrogen. A third, ASACUSA, traps the antiprotons in a cage conveniently provided by nature – the helium atom. The goal of all three is a detailed comparison of matter and antimatter leading to an understanding of why nature has a preference for matter over antimatter. The first steps at CERN on this path were taken in a series of experiments, between 1982 and 1996, at the Laboratory's LEAR facility, where the techniques for trapping antiprotons were developed. In 1995 the first man-made atoms of antihydrogen were made at LEAR. Those atoms were fast-moving and soon annihilated with matter. However, the experiment demonstrated that anti-atoms could be made, and with the AD the quest begins to make antihydrogen atoms that are slow enough to be trapped, whereupon lasers directed at them can probe for tiny differences between antihydrogen and hydrogen. The successful start-up of the new AD facility gives the international physics community a new instrument to examine nature and perhaps answer the question, "Why do we live in a matter universe?" For more information on the individual experiments go to the following pages: ATHENA ATRAP ASACUSA AD 1.CERN, the European Organization for Nuclear Research, has its headquarters in Geneva. At present, its Member States are Austria, Belgium, Bulgaria, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Israel, Japan, the Russian Federation, the United States of America, Turkey, the European Commission and Unesco have observer status." /> <meta property="og:image" content="https://cds.cern.ch/images//file?size=medium" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:description" content="Geneva, 10 August 2000. CERN1's unique new antimatter factory, the Antiproton Decelerator (AD) has begun delivering antiprotons to experiments. These experiments will study antimatter in depth to determine if there is a difference between it and ordinary matter. Any difference between antimatter and matter would be extremely interesting since it is not yet understood why the universe is made of matter. Physicists believe that the Big Bang created equal amounts of antimatter and matter, which would then have annihilated, leaving nothing. The great mystery is why there was enough matter left over to from the universe. CERN is probably best known for enormous accelerators and research using very high energy particle beams. The AD is the antithesis. It is only 188 metres in circumference and is designed to actually decelerate particles rather than accelerate them. It takes high energy antiprotons, groups them together tightly in bunches, slows them down to the leisurely pace - by CERN standards - of a tenth of the speed of light, and delivers them to experiments. At this point, the remarkable technical sophistication of the experiments takes over. The experiments either capture the antiprotons in cages of electromagnetic fields or insert them into ordinary atoms. The velocity of the trapped antiprotons is now reduced to a few millionths of the speed of light. The once unruly antiprotons are virtually at standstill and further study can begin. Two experiments, ATHENA and ATRAP, aim to add positrons - anti-electrons - to the caged antiprotons to make atoms of antihydrogen. A third, ASACUSA, traps the antiprotons in a cage conveniently provided by nature – the helium atom. The goal of all three is a detailed comparison of matter and antimatter leading to an understanding of why nature has a preference for matter over antimatter. The first steps at CERN on this path were taken in a series of experiments, between 1982 and 1996, at the Laboratory's LEAR facility, where the techniques for trapping antiprotons were developed. In 1995 the first man-made atoms of antihydrogen were made at LEAR. Those atoms were fast-moving and soon annihilated with matter. However, the experiment demonstrated that anti-atoms could be made, and with the AD the quest begins to make antihydrogen atoms that are slow enough to be trapped, whereupon lasers directed at them can probe for tiny differences between antihydrogen and hydrogen. The successful start-up of the new AD facility gives the international physics community a new instrument to examine nature and perhaps answer the question, "Why do we live in a matter universe?" For more information on the individual experiments go to the following pages: ATHENA ATRAP ASACUSA AD 1.CERN, the European Organization for Nuclear Research, has its headquarters in Geneva. At present, its Member States are Austria, Belgium, Bulgaria, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Israel, Japan, the Russian Federation, the United States of America, Turkey, the European Commission and Unesco have observer status." /> <meta name="twitter:site" content="@cern" /> <meta name="twitter:title" content="Start-up of CERN's New Antimatter Factory" /> <meta name="twitter:image" content="https://cds.cern.ch/images//file?size=medium" /> <meta name="Generator" content="Drupal 10 (https://www.drupal.org)" /> <meta name="MobileOptimized" content="width" /> <meta name="HandheldFriendly" content="true" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <link rel="icon" href="/sites/default/themes/custom/cernpublic/favicon.ico" type="image/vnd.microsoft.icon" /> <link rel="alternate" hreflang="en" href="https://home.cern/news/press-release/cern/start-cerns-new-antimatter-factory" /> <link rel="alternate" hreflang="fr" href="https://home.cern/fr/news/press-release/cern/start-cerns-new-antimatter-factory" /> <title>Start-up of CERN's New Antimatter Factory | 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BIRTH OF WEB, LHC...</span> <div class="search-block-form block block-search block-search-form-block" data-drupal-selector="search-block-form" role="search"> <form action="/search/node" method="get" id="search-block-form" accept-charset="UTF-8"> <div class="form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group"> <label for="edit-keys" class="control-label sr-only">Search</label> <div class="input-group"><input title="Enter the terms you wish to search for." data-drupal-selector="edit-keys" class="form-search form-control" placeholder="Search" type="search" id="edit-keys" name="keys" value="" size="15" maxlength="128" data-toggle="tooltip" /><span class="input-group-btn"><button type="submit" value="Search" class="button js-form-submit form-submit btn-primary btn icon-only"><span class="sr-only">Search</span><span class="icon glyphicon glyphicon-search" aria-hidden="true"></span></button></span></div> </div> <div class="form-actions form-group js-form-wrapper form-wrapper" data-drupal-selector="edit-actions" id="edit-actions"></div> </form> </div> </div> </div> </li> <li class="dropdown cern-menu-lang-switcher"> <a class="dropdown-toggle" data-toggle="dropdown" aria-expanded="true"> <span class="separator">|</span> en <span class="caret"></span> </a> <ul class="dropdown-menu"> <li><section class="language-switcher-language-url block block-language block-language-blocklanguage-interface clearfix" role="navigation"> <ul class="links"><li hreflang="en" data-drupal-link-system-path="node/2658" class="en is-active"><a href="/news/press-release/cern/start-cerns-new-antimatter-factory" class="language-link is-active" hreflang="en" data-drupal-link-system-path="node/2658">en</a></li><li hreflang="fr" data-drupal-link-system-path="node/2658" class="fr"><a href="/fr/news/press-release/cern/start-cerns-new-antimatter-factory" class="language-link" hreflang="fr" data-drupal-link-system-path="node/2658">fr</a></li></ul> </section> </li> </ul> </li> </ul> </div>  </div>  </nav> </nav> </div> </section> </div> </div> </div> </div> </header> <main role="main"> <a id="main-content" tabindex="-1"></a> <div class="container cern-page-display-page cern-page-display-news_page"> <div class="has-right-column wrapper-center col-md-9 col-sm-12 col-xs-12"> <div class="region region-content"> <div data-drupal-messages-fallback class="hidden"></div> <div data-drupal-messages-fallback class="hidden"></div> <div class="row mt-2"> <div class="col-md-12 news-node-full-content-first-breadcrumbs"> <a href="/news"> News </a> <a href="/news?type=40 "> Press release </a> <a href="/news?type=40 &topic=1118 "> Topic: At CERN </a> </div> <div class="col-md-12"> <hr class="news-page-hr-separator"/> </div> </div> <div class="row news-node-center-content clearfix"> <div class="col-md-12 news-node-full-content-left"> <div class="news-node-full-content-view-language mt-1 mb-1"> <p>Voir en</p> <a href="/fr/news/press-release/cern/start-cerns-new-antimatter-factory">français</a> </div> <h1 class="news-node-full-content-title mt-0"> Start-up of CERN's New Antimatter Factory </h1> <div class="news-node-full-content-created-date-author"> <p class="news-node-full-content-created_date"> <time datetime="2000-08-10T08:00:00Z">10 August, 2000</time> </p> </div> <div class="news-node-full-content-image mt-2"> </div> <div class="news-node-full-content-body clearfix full-html-markup full-text-animation"> <p>Geneva, 10 August 2000. CERN<sup>1</sup>'s unique new antimatter factory, the Antiproton Decelerator (AD) has begun delivering antiprotons to experiments. These experiments will study antimatter in depth to determine if there is a difference between it and ordinary matter.</p> <p>Any difference between antimatter and matter would be extremely interesting since it is not yet understood why the universe is made of matter. Physicists believe that the Big Bang created equal amounts of antimatter and matter, which would then have annihilated, leaving nothing. The great mystery is why there was enough matter left over to<strong> </strong>from the universe.</p> <p>CERN is probably best known for enormous accelerators and research using very high energy particle beams. The AD is the antithesis. It is only 188 metres in circumference and is designed to actually decelerate particles rather than accelerate them. It takes high energy antiprotons, groups them together tightly in bunches, slows them down to the leisurely pace - by CERN standards - of a tenth of the speed of light, and delivers them to experiments. At this point, the remarkable technical sophistication of the experiments takes over. The experiments either capture the antiprotons in cages of electromagnetic fields or insert them into ordinary atoms. The velocity of the trapped antiprotons is now reduced to a few millionths of the speed of light. The once unruly antiprotons are virtually at standstill and further study can begin.</p> <p>Two experiments, ATHENA and ATRAP, aim to add positrons - anti-electrons - to the caged antiprotons to make atoms of antihydrogen. A third, ASACUSA, traps the antiprotons in a cage conveniently provided by nature – the helium atom. The goal of all three is a detailed comparison of matter and antimatter leading to an understanding of why nature has a preference for matter over antimatter.</p> <p>The first steps at CERN on this path were taken in a series of experiments, between 1982 and 1996, at the Laboratory's LEAR facility, where the techniques for trapping antiprotons were developed. In 1995 the first man-made atoms of antihydrogen were made at LEAR. Those atoms were fast-moving and soon annihilated with matter. However, the experiment demonstrated that anti-atoms could be made, and with the AD the quest begins to make antihydrogen atoms that are slow enough to be trapped, whereupon lasers directed at them can probe for tiny differences between antihydrogen and hydrogen.</p> <p>The successful start-up of the new AD facility gives the international physics community a new instrument to examine nature and perhaps answer the question<em>, "Why do we live in a matter universe?"</em></p> <p>For more information on the individual experiments go to the following pages:</p> <p><a href="https://greybook.cern.ch/experiment/detail?id=AD-1"><strong>ATHENA</strong></a></p> <p><strong><a href="/science/experiments/atrap">ATRAP</a></strong></p> <p><strong><a href="/science/experiments/asacusa">ASACUSA</a> </strong></p> <p><strong><a href="/science/accelerators/antiproton-decelerator">AD</a></strong></p> <p> </p> <p>1.CERN, the European Organization for Nuclear Research, has its headquarters in Geneva. At present, its Member States are Austria, Belgium, Bulgaria, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Israel, Japan, the Russian Federation, the United States of America, Turkey, the European Commission and Unesco have observer status.</p> </div> </div> </div> </div> </div> <div class="sidebar-right col-md-3 col-sm-12 col-xs-12"> </div> </div> <div class="content-footer-wrapper"> <div class="has-right-column row content-footer-row container"> <div class="col-md-12 content-footer-container"> <div class="region region-contentfooter"> <section class="views-element-container block block-views block-views-blocknews-microviews-block-13 clearfix" id="block-views-block-news-microviews-block-13"> <div class="form-group"> <div class="horizontal-boxes view view-news-microviews view-id-news_microviews view-display-id-block_13 js-view-dom-id-0c904ccc19b322e0f911a01b47dd00bd24f042017ec8c561758b54deea3bac48 cern-view-display-block cern-view-display-block_13 clearfix"> <div class="view-header"> <h2>Also On At CERN</h2> </div> <div class="view-content clearfix"> <div class="carousel-cern-item row"> 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